Capacitor and method for manufacturing same

Abstract

A capacitor has electrode foil (2, 60) and a terminal (tab 4) connected, an etch layer (16) being formed in the electrode foil, wherein a plurality of interrupting parts (12) are included in the etch layer, which is formed in the electrode foil, and at least in a connection part (stitching part 6) at which the terminal is connected. It makes it possible for the electrode foil of a higher capacitance to have flexibility, makes it possible to suppress cracks caused by pressing, and makes it possible to prevent cracks from spreading. In addition, such effects are expected that the electrode foil can be prevented from being damaged in a process of connecting the tab including folding the electrode foil, and pressing raised pieces of the electrode foil and the tab onto the electrode foil.

The invention claimed is: 
     
       1. A capacitor comprising:
 electrode foil, an etch layer being formed in the electrode foil, and 
 a terminal connected to the electrode foil by stitching, wherein 
 the electrode foil includes a plurality of interrupting parts in the etch layer, the plurality of interrupting parts being linear and being formed along a shorter side of the electrode foil, at least a part of each interrupting part being placed in a stitching part at which the terminal is connected, the stitching part being defined as an inside of a circle passing through tips of raised pieces of the terminal, the raised pieces abutting on a back face of the electrode foil. 
 
     
     
       2. The capacitor according to  claim 1 , wherein
 a foil core portion is formed in the electrode foil, and 
 the electrode foil comprises the plurality of interrupting parts except for the foil core portion. 
 
     
     
       3. The capacitor according to  claim 1 , wherein
 the electrode foil comprises the plurality of interrupting parts on an end part of the electrode foil in a vicinity of the stitching part at which the terminal is connected. 
 
     
     
       4. The capacitor according to  claim 1 , wherein
 the electrode foil comprises the plurality of interrupting parts in either one or both of face s in the stitching part, one of the faces abutting on a part of the terminal, the part passing through the electrode foil, the other of the faces not abutting on the part of the terminal. 
 
     
     
       5. The capacitor according to  claim 1 , wherein
 each of the plurality of interrupting parts has a shape of a straight line of a predetermined length, a curved line of a predetermined length, or a crossing lines, or any combination thereof. 
 
     
     
       6. The capacitor according to  claim 1 , wherein the electrode foil comprises the plurality of interrupting parts in either one or both faces thereof. 
     
     
       7. The capacitor according to  claim 6 , wherein
 a foil core portion is formed in the electrode foil, and 
 the plurality of interrupting parts in both faces of the electrode foil are arranged either at positions where the plurality of interrupting parts face each other across the foil core portion, or at positions where the plurality of interrupting parts do not face each other across the foil core portion. 
 
     
     
       8. The capacitor according to  claim 1 , wherein
 the electrode foil includes an opening in the stitching part, 
 the terminal includes an opening and the raised pieces in the stitching part, 
 the raised pieces pass through the opening of the electrode foil, and 
 the etch layer includes the plurality of interrupting parts within a range where the raised pieces abut. 
 
     
     
       9. The capacitor according to  claim 1 , wherein
 the plurality of interrupting parts has an opening width of not less than 0 μm and not more than 50 μm when the electrode foil is laid flat, and 
 surfaces of each interrupting part at least partially come into contact with each other when the opening width is 0 μm and the electrode foil is laid flat. 
 
     
     
       10. A method for manufacturing a capacitor having electrode foil and a terminal connected to the electrode foil by stitching, the method comprising:
 forming a plurality of interrupting parts in an etch layer formed in the electrode foil, the plurality of interrupting parts being linear and being formed along a shorter side of the electrode foil, at least a part of each interrupting part being placed in a stitching part at which the terminal is to be connected; and 
 arranging the terminal at the stitching part, to connect the terminal by the stitching, wherein 
 the stitching part is defined as an inside of a circle passing through tips of raised pieces of the terminal, and the raised pieces abut on a back face of the electrode foil. 
 
     
     
       11. The capacitor according to  claim 1 , wherein
 the plurality of interrupting parts is arranged so that mean pitch between adjacent interrupting parts is not more than 2100 μm. 
 
     
     
       12. The method for manufacturing the capacitor according to  claim 10 , wherein
 the plurality of interrupting parts has an opening width of not less than 0 μm and not more than 50 μm when the electrode foil is laid flat, and 
 surfaces of each interrupting part at least partially come into contact with each other when the opening width is 0 μm and the electrode foil is laid flat. 
 
     
     
       13. The method for manufacturing the capacitor according to  claim 10 , wherein plurality of interrupting parts is arranged so that mean pitch between adjacent interrupting parts is not more than 2100 μm.